New Delhi: Convalescent plasma therapy did not show benefit in reducing mortality risk among COVID-19 patients, according to an interim analysis of a randomised controlled trial done at AIIMS here to assess the efficacy of this mode of treatment.The therapy involves taking antibodies from the blood of a person who has recovered from COVID-19 and transfusing those into an active coronavirus infected patient to help kickstart the immune system to fight back the infection.AIIMS Director Dr Randeep Guleria told PTI on Thursday no clear mortality benefit of convalescent plasma therapy was seen during a trial conducted among 30 COVID-19 patients.During the trial, one group of patients was given convalescent plasma therapy along with the standard.